121 research outputs found
Two-Higgs-Doublet type-II and -III models and at the LHC
We study the constraints of the generic two-Higgs-doublet model (2HDM)
type-III and the impacts of the new Yukawa couplings. For comparisons, we
revisit the analysis in the 2HDM type-II. To understand the influence of all
involving free parameters and to realize their correlations, we employ
-square fitting approach by including theoretical and experimental
constraints, such as S, T, and U oblique parameters, the production of standard
model Higgs and its decay to , , , etc.
The errors of analysis are taken at , , and confidence
levels. Due to the new Yukawa couplings being associated with
and , we find that the allowed
regions for and in the type-III model can be broader
when the dictated parameter is positive; however, for negative
, the limits are stricter than those in the type-II model. By using the
constrained parameters, we find that the deviation from the SM in the can be of . Additionally, we also study the top-quark
flavor-changing processes induced at the tree level in the type-III model and
find that when all current experimental data are considered, we get for and GeV and
slightly exceeds for GeV.Comment: 22 pages, 11 figures. v3: Slight change in the abstract, Figure.1
added and commented, the conclusion remains unchange
Hunting light Higgses at the LHC in the context of the 2HDM Type-I
We show the reinterpretation of existing searches for exotic decays of the
Standard Model (SM)-like Higgs, , in various final states, in
the framework of the 2-Higgs Doublet Model (2HDM) Type-I. We then explore a new
search for such light Higgses, and , at the Large Hadron Collider (LHC)
Run 3 for an integrated luminosity of 300 . After performing a
scan over the model parameters, we found that the inverted scenario of Type-I
offers a new promising signal in the form of the following cascade decays: . We investigate
then its significance through a full Monte Carlo (MC) simulation down to the
detector level.Comment: Talk presented at the 41st International Conference on High Energy
physic
Analysis of the process in the 2HDM lepton specific model at the LHC
We analyse the signature of a light Higgs boson pair in the 2-Higgs Doublet
Model(2HDM) Type-X (or lepton specific) over the parameter spaces allowed by
theoretical self-consistency requirements as well as the latest experimental
constraints from the Large Hadron Collider (LHC), precision test data and
physics. Over the viable regions of the latter, wherein the Standard Model
(SM)-like Higgs boson discovered at the LHC in 2012 is the heavier CP-even
state of the 2HDM, , it is found that the SM-like Higgs boson can decay into
a pair of the lighter CP-even Higgs boson, , via the process with
a Branching Ratio (BR) of or so, (with GeV).
Furthermore, in the Type-X scenario, the lighter Higgs bosons can
dominantly decay into two 's due to a large . Therefore, the
pair of lighter Higgs bosons can altogether decay into a 4 final state.
In order to suppress the huge SM background events, we confine ourself to
consider the fraction of signal events with two Same-Sign (SS) 's further
decaying into same sign leptons while the other two 's decay
hadronically. By using Monte Carlo (MC) and Machine Learning (ML) tools, we
thus focus on the analysis of the signal process
(where and means a hadronic decay of the ) and
explore the feasibility of such a search at the LHC for a collision energy
and a luminosity Comment: 19 pages, 7 figures, 7 tables. arXiv admin note: text overlap with
arXiv:2305.0578
Perceived coercion in psychiatric hospital admission: validation of the French-language version of the MacArthur Admission Experience Survey.
The MacArthur Admission Experience Survey (AES) is a widely used tool to evaluate the level of perceived coercion experienced at psychiatric hospital admission. The French-language AES was prepared using a translation/back-translation procedure. It consists of 16 items and 3 subscores (perceived coercion, negative pressures and voice). This study aimed to assess the psychometric properties of the French-language AES.
152 inpatients were evaluated. Reliability was estimated using internal consistency coefficients and a test-retest procedure. Internal validity was assessed using a two-parameter logistic item response model. Convergent validity was estimated using correlations between the AES scores and the Coercion Ladder (CL), the Coercion Experience Scale (CES) and the Global Assessment of Functioning (GAF) scale. Discriminatory power was evaluated by comparing the scores of patients undergoing voluntary or compulsory admission.
The French-language AES showed good internal consistency and test-retest reliability. Internal validity of the three-factor model was excellent. Correlations between AES and CL, CES and GAF scores suggested good convergent validity. AES scores were significantly higher among patients subject to compulsory psychiatric hospital admission than among those admitted voluntarily.
Overall, the French-language version of the AES demonstrated very good psychometric proprieties
Fractionation of lead in soil by isotopic dilution and sequential extraction
‘Reactivity’ or ‘lability’ of lead is difficult to measure using traditional methods. We investigated the use of isotopic dilution with 204Pb to determine metal reactivity in four soils historically contaminated with contrasting sources of Pb, including (i) petrol-derived Pb, (ii) Pb/Zn minespoil, (iii) long-term sewage sludge application and (iv) 19th century urban waste disposal; total soil Pb concentrations ranged from 217 to 13 600 mg kg–1. A post-spike equilibration period of 3 days and suspension in 5.0 × 10–4 M ethylenediaminetetraacetic acid provided reasonably robust conditions for measuring isotopically exchangeable Pb. However, in acidic organic soils a dilute Ca(NO3)2 electrolyte may be preferable to avoid mobilisation of ‘non-labile’ Pb. Results showed that the reactive pool of soil Pb can be a large proportion of the total soil lead content but varies with the original Pb source. A comparison of isotopic exchangeability with the results of a sequential extraction procedure showed that (isotopically) ‘non-labile’ Pb may be broadly equated with ‘residual’ Pb in organic soils. However, in mineral soils the ‘carbonate’ and ‘oxide-bound’ Pb fractions included non-labile forms of Pb. The individual isotopic signatures of labile and non-labile Pb pools suggested that, despite prolonged contact with soil, differences between the lability of the original contaminant and the native soil Pb may remain
Scorpion sting: a public health problem in El Kelaa des Sraghna (Morocco)
The present study aimed at verifying the impact of a Moroccan strategy against scorpion stings and specifically at identifying the epidemiological features of patients envenomed or just stung by scorpions. It included 11,907 patients from El Kelaa des Sraghna Province, Morocco, who were evaluated over five years (2001-2005). Most stings occurred during the hot period and mainly at night. The average incidence was 3.2 per 1,000 inhabitants; patients <15 years accounted for 34%, and the envenomation rate was 12%. Average lethality rate was 0.7%. Our work evaluated the efficacy of the adopted strategy based on indicators of follow-up, morbidity and lethality due to scorpion sting and envenomation
Pentraxin 3 (PTX3) Expression in Allergic Asthmatic Airways: Role in Airway Smooth Muscle Migration and Chemokine Production
Pentraxin 3 (PTX3) is a soluble pattern recognition receptor with non-redundant functions in inflammation and innate immunity. PTX3 is produced by immune and structural cells. However, very little is known about the expression of PTX3 and its role in allergic asthma.We sought to determine the PTX3 expression in asthmatic airways and its function in human airway smooth muscle cells (HASMC). In vivo PTX3 expression in bronchial biopsies of mild, moderate and severe asthmatics was analyzed by immunohistochemistry. PTX3 mRNA and protein were measured by real-time RT-PCR and ELISA, respectively. Proliferation and migration were examined using (3)H-thymidine incorporation, cell count and Boyden chamber assays.PTX3 immunoreactivity was increased in bronchial tissues of allergic asthmatics compared to healthy controls, and mainly localized in the smooth muscle bundle. PTX3 protein was expressed constitutively by HASMC and was significantly up-regulated by TNF, and IL-1β but not by Th2 (IL-4, IL-9, IL-13), Th1 (IFN-γ), or Th-17 (IL-17) cytokines. In vitro, HASMC released significantly higher levels of PTX3 at the baseline and upon TNF stimulation compared to airway epithelial cells (EC). Moreover, PTX3 induced CCL11/eotaxin-1 release whilst inhibited the fibroblast growth factor-2 (FGF-2)-driven HASMC chemotactic activity.Our data provide the first evidence that PTX3 expression is increased in asthmatic airways. HASMC can both produce and respond to PTX3. PTX3 is a potent inhibitor of HASMC migration induced by FGF-2 and can upregulate CCL11/eotaxin-1 release. These results raise the possibility that PTX3 may play a dual role in allergic asthma
First Human Model of In Vitro Candida albicans Persistence within Granuloma for the Reliable Study of Host-Fungi Interactions
BACKGROUND: The balance between human innate immune system and Candida albicans virulence signaling mechanisms ultimately dictates the outcome of fungal invasiveness and its pathology. To better understand the pathophysiology and to identify fungal virulence-associated factors in the context of persistence in humans, complex models are indispensable. Although fungal virulence factors have been extensively studied in vitro and in vivo using different immune cell subsets and cell lines, it is unclear how C. albicans survives inside complex tissue granulomas. METHODOLOGY/PRINCIPAL FINDING: We developed an original model of in vitro human granuloma, reproducing the natural granulomatous response to C. albicans. Persistent granulomas were obtained when the ratio of phagocytes to fungi was high. This in vitro fungal granuloma mimics natural granulomas, with infected macrophages surrounded by helper and cytotoxic T lymphocytes. A small proportion of granulomas exhibited C. albicans hyphae. Histological and time-lapse analysis showed that C. albicans blastoconidia were located within the granulomas before hyphae formation. Using staining techniques, fungal load calculations, as well as confocal and scanning electron microscopy, we describe the kinetics of fungal granuloma formation. We provide the first direct evidence that C. albicans are not eliminated by immunocompetent cells inside in vitro human granulomas. In fact, after an initial candicidal period, the remaining yeast proliferate and persist under very complex immune responses. CONCLUSIONS/SIGNIFICANCE: Using an original in vitro model of human fungal granuloma, we herein present the evidence that C. albicans persist and grow into immunocompetent granulomatous structures. These results will guide us towards a better understanding of fungal invasiveness and, henceforth, will also help in the development of better strategies for its control in human physiological conditions
- …